Figure | Principle and system configuration of L²-CPI. (IMAGE)
Caption
Figure | Principle and system configuration of L²-CPI. a, The schematic diagram illustrating the difference between L2-CPI and the conventional QPI. b, The relationship between resolution and FOV in conventional QPI and L2-CPI. 0.61λ represents the theoretical maximum achievable resolution limit by conventional dry optical microscopy systems. The blue box delineates the range of field of view (FOV) and resolution capabilities attainable with objective lenses of varying magnifications. In contrast, the gray curve illustrates the FOV limits imposed by these lenses at different magnifications. c, The optical configuration of L2-CPI. d, The schematic diagram illustrating the data acquisition process of L2-CPI. The gray structures on the left represent the sample, which consists of four letters: “HUST.” The purple boxes on the sample represent the imaging area, which corresponds to the camera's sensing area. As the sample moves along the scanning direction, many interferograms are captured. See the three representative interferograms corresponding to the sample's three positions along the scanning direction (i.e., x-axis) in Fig. 1d. The three red lines in the three interferograms correspond to precisely the same positions (i.e., the cross-sections along the y-axis) on the sample’s surface. For a given cross-section on the sample’s surface, its corresponding interferogram lines (i.e., the red lines) in all the interferograms are extracted to form a sampling sequence (i.e., see the dark green box marked by “sampling sequence” in Fig. 1d) in first-come-first-served order. The phase-retrieval algorithm can then be applied to the sampling sequence to recover the phase corresponding to the cross-section on the sample’s surface.
Credit
Jinlong Zhu et al.
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